Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 41, Pages 27632-27641Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b06456
Keywords
lithium-ion batteries; cathode materials; phosphates; LiMnPO4 center dot Li3V2(PO4)(3)/C; hybrid nanostructure
Funding
- National High Technology Research and Development Program of China (863 Program) [2013AA110106]
- National Natural Science Foundation of China [51374255, 51302323]
- Program for New Century Excellent Talents in University [NCET-13-0594]
- Research Fund for the Doctoral Program of Higher Education of China [201301621200]
- Natural Science Foundation of Hunan Province, China [14JJ3018]
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Olivine-type structured LiMnPO4 has been extensively studied as a high-energy density cathode material for lithium-ion batteries. However, preparation of high-performance LiMnPO4 is still a large obstacle due to its intrinsically sluggish electrochemical kinetics. Recently, making the composites from both active components has been proven to be a good proposal to improve the electrochemical properties of cathode materials. The composite materials can combine the advantages of each phase and improve the comprehensive properties. Herein, a LiMnPO4 center dot Li3V2(PO4)3/C composite with interconnected nanorods and nanoflakes has been synthesized via a one-pot, solid-state reaction in molten hydrocarbon, where the oleic acid functions as a surfactant. With a highly uniform hybrid architecture, conductive carbon coating, and mutual cross-doping, the LiMnPO4 center dot Li3V2(PO4)(3)/C composite manifests high capacity, good rate capability, and excellent cyclic stability in lithium-ion batteries. The composite electrodes deliver a high reversible capacity of 101.3 mAh g(-1) at the rate up to 16 C. After 4000 long-term cycles, the electrodes can still retain 79.39% and 72.74% of its maximum specific discharge capacities at the rates of 4C and 8C, respectively. The results demonstrate that the nanorod-nanoflake interconnected LiMnPO4 center dot Li3V2(PO4)(3)/C composite is a promising cathode material for high-performance lithium ion batteries.
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